气动执行器由（ ）组成。

A、<span style="font-size:16px;font-family:宋体">活塞&nbsp; &nbsp;</span>

B、<span style="font-size:16px;font-family:宋体">膜片&nbsp; &nbsp;</span>

C、<span style="font-size:16px;font-family:宋体">执行机构&nbsp; &nbsp;</span>

D、<span style="font-size:16px;font-family:宋体">控制阀&nbsp; &nbsp;</span>

E、<span style="font-size:16px;font-family:宋体">杠杆</span>